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• How to restrict fetching hls segment files on pause in Safari (MacOS and iOS)

  24 juillet 2021, par Charan Kumar

  We generate hls files with segment size of 3 seconds. We use hlsjs for non Safari browsers and Safari has native hls support.

  


  In hlsjs world we were able to restrict how much ahead we should be in terms of buffer using maxMaxBufferLength, where as we are unable to find similar solution for Safari. In Safari, after loading video m3u8, even if I pause after a second, in the network tab I can see that all the segments are being fetched which I would like to restrict.

  


  I'll not be able to share our examples due to company polices. But, a public example file by hls.js is attached below :

  


  https://test-streams.mux.dev/x36xhzz/url_6/193039199_mp4_h264_aac_hq_7.m3u8 try opening this url in Safari, and try pausing the video, you'll see that it continues to download. Where as if you open same one using https://hls-js.netlify.app/demo/ with maxMaxBufferLength : 5 it won't happen.

  


  Is there an option at ffmpeg to make it controlled buffer or some solution that we should do for Safari by listening to events ?

  


  Found the same question here -> https://developer.apple.com/forums/thread/121074

  


• How to extract frames from a video with transparency ?

  10 août 2017, par Ahtsham Abbasi

  How do I extract frames from a video (.mov Apple ProRes 4444) with the alpha channel ?

  I need the PNG images so transparency is not lost.

  I have 23 videos so I would prefer to automate the process.

• How to set the destination folder of a Node.js fluent-ffmpeg screenshot to your AWS S3 bucket using getSignedUrl() ?

  10 juillet 2017, par Madhavi Mohoni

  I’m writing a program to generate .png thumbnails (with the same name, in the same folder) for a set of .mp4 videos in my Amazon S3 bucket. For this example, I’m going to create a /folder/file.png for a /folder/file.mp4 in the bucket. I’ve managed to set the source URL using the s3 object and getSignedUrl as follows :

  var srcurl = s3.getSignedUrl('getObject', {
  
          Bucket: 'bucket-name',
  
          Key: '/folder/file.mp4'
  
        });

  and

  new ffmpeg({ source: srcurl })
  
       .screenshots({
  
          count: 1, 
  
          filename: '%f'.substr(0, '%f'.indexOf('.')) + '.png', 
  
          /* To shorten the long string that's returned */ 
  
          folder: desturl,
  
          size: MAX_WIDTH + 'x' + MAX_HEIGHT
  
        });

  The destination URL has to be the same folder as the source. So I set it as follows :

  var desturl = s3.getSignedUrl('putObject', {
  
          Bucket: 'bucket-name',
  
          Key: '/folder/file' + '.png'
  
        });

  This combination doesn’t work - is there a way to do this correctly ?